A novel imaging system of optical detection on cancers and tissues in gastrointestinal endoscope using high-color-rendering white and color tunable LEDs

2010 ◽  
Author(s):  
Jun Nishikawa ◽  
Tsunemasa Taguchi ◽  
Yuji Uchida ◽  
Satoshi Kurai ◽  
Hideo Yanai ◽  
...  
Keyword(s):  
Imaging System ◽  
Optical Detection ◽  
Color Tunable ◽  
Color Rendering ◽  
Gastrointestinal Endoscope

Crystal structure and photoluminescence tuning of novel single-phase Ca8ZnLu(PO4)7:Eu2+,Mn2+ phosphors for near-UV converted white light-emitting diodes

2019 ◽  
Vol 7 (27) ◽  
pp. 8374-8382 ◽  
Author(s):  
Jing Yan ◽  
Ziwang Zhang ◽  
Dawei Wen ◽  
Jianbang Zhou ◽  
Yiqin Xu ◽  
...  
Keyword(s):  
Crystal Structure ◽  
White Light ◽  
Single Phase ◽  
Light Emitting Diodes ◽  
Light Emitting ◽  
Color Tunable ◽  
Color Rendering Index ◽  
White Light Emitting Diodes ◽  
Color Rendering

A single phase color-tunable white light emitting Ca8ZnLu(PO4)7:Eu2+,Mn2+ phosphor with high color rendering index has been rationally designed via combination of cyan and red emissions.

scholarly journals A comparison between a white LED confocal imaging system and a conventional flash fundus camera using chromaticity analysis

2019 ◽  
Vol 19 (1) ◽  
Author(s):  
Valentina Sarao ◽  
Daniele Veritti ◽  
Enrico Borrelli ◽  
Srini Vas R. Sadda ◽  
Enea Poletti ◽  
...  
Keyword(s):  
Imaging System ◽  
Color Images ◽  
Confocal Imaging ◽  
Fundus Images ◽  
White Led ◽  
Discriminative Power ◽  
High Quality ◽  
Fundus Camera ◽  
Clear Shift ◽  
Color Rendering

Abstract Background Conventional flash fundus cameras capture color images that are oversaturated in the red channel and washed out in the green and blue channels, resulting in a retinal picture that often looks flat and reddish. A white LED confocal device was recently introduced to provide a high-quality retinal image with enhanced color fidelity. In this study, we aimed to evaluate the color rendering properties of the white LED confocal system and compare them to those of a conventional flash fundus camera through chromaticity analysis. Methods A white LED confocal device (Eidon, Centervue, Padova, Italy) and a traditional flash fundus camera (TRC-NW8, Topcon Corporation, Tokyo, Japan) were used to capture fundus images. Color images were evaluated with respect to chromaticity. Analysis was performed according to the image color signature. The color signature of an image was defined as the distribution of its pixels in the rgb chromaticity space. The descriptors used for the analysis are the average and variability of the barycenter positions, the average of the variability and the number of unique colors (NUC) of all signatures. Results Two hundred thirty-three color photographs were acquired with each retinal camera. The images acquired by the confocal white LED device demonstrated an average barycenter position (rgb = [0.448, 0.328, 0.224]) closer to the center of the chromaticity space, while the conventional fundus camera provides images with a clear shift toward red at the expense of the blue and green channels (rgb = [0.574, 0.278, 0.148] (p < 0.001). The variability of the barycenter positions was higher in the white LED confocal system than in the conventional fundus camera. The average variability of the distributions was higher (0.003 ± 0.007, p < 0.001) in the Eidon images compared to the Topcon camera, indicating a greater richness of color. The NUC percentage was higher for the white LED confocal device than for the conventional flash fundus camera (0.071% versus 0.025%, p < 0.001). Conclusions Eidon provides more-balanced color images, with a wider richness of color content, compared to a conventional flash fundus camera. The overall higher chromaticity of Eidon may provide benefits in terms of discriminative power and diagnostic accuracy.

Color-tunable Al6Si2O13:Eu2+,Mn2+ phosphor with high color rendering index based on energy transfer for warm white LEDs

2018 ◽  
Vol 42 (18) ◽  
pp. 15207-15214 ◽  
Author(s):  
Bo Yan ◽  
Gui-Gen Wang ◽  
Long-Fei Liu ◽  
Xin-Zhong Wang ◽  
You-Xiao Chen ◽  
...  
Keyword(s):  
Energy Transfer ◽  
White Light ◽  
White Led ◽  
Light Emitting ◽  
White Leds ◽  
Warm White Light ◽  
Color Tunable ◽  
Color Rendering Index ◽  
Color Rendering

A type of warm-white-light-emitting Al6Si2O13:Eu2+,Mn2+ phosphor with high color rendering index was synthesized for UV-excited white LED.

Samarium and manganese incorporation to improve color rendering of LuAG:Ce3+ phosphor ceramic for laser-driven lighting: Color-tunable and energy transfer study†

2021 ◽  
Author(s):  
Bingheng Sun ◽  
Benxue Jiang ◽  
Long Zhang
Keyword(s):  
Energy Transfer ◽  
The Real ◽  
Color Tunable ◽  
Color Rendering ◽  
Transfer Study

The deficient red and cyan components are critical limitations that hamper the real applications of single-structured phosphor ceramics in laser-driven white lighting sources (white LDs). In this study, Ce3+ and...

Platinum(ii) cyclometallates featuring broad emission bands and their applications in color-tunable OLEDs and high color-rendering WOLEDs

2016 ◽  
Vol 4 (25) ◽  
pp. 6016-6026 ◽  
Author(s):  
Guiping Tan ◽  
Shuming Chen ◽  
Chi-Ho Siu ◽  
Adam Langlois ◽  
Yongfu Qiu ◽  
...  
Keyword(s):  
Solid State ◽  
Broad Emission ◽  
Color Tunable ◽  
Color Rendering

Two new phosphorescent platinum(ii) cyclometallates with flexible phenoxy moieties were prepared whose broad excimeric emissive states in the solid state allow the fabrication of high color-rendering two-emitter WOLEDs.

scholarly journals Color-tunable bioluminescence imaging portfolio for cell imaging

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Shota Tamaki ◽  
Nobuo Kitada ◽  
Masahiro Kiyama ◽  
Rika Fujii ◽  
Takashi Hirano ◽  
...  
Keyword(s):  
Mammalian Cells ◽  
Density Functional ◽  
Cell Imaging ◽  
Imaging System ◽  
Visible Region ◽  
Theoretical Background ◽  
Functional Theory ◽  
Color Palette ◽  
Molecular Events ◽  
Color Tunable

AbstractThe present study describes a color-tunable imaging portfolio together with twelve novel coelenterazine (CTZ) analogues. The three groups of CTZ analogues create diverse hues of bioluminescence (BL) ranging from blue to far red with marine luciferases. We found that the hue completes the whole color palette in the visible region and shows red-shifted BL with a marine luciferase: for example, Renilla luciferase 8 (RLuc8) and Artificial Luciferase 16 (ALuc16) show 187 nm- and 105 nm-redshifted spectra, respectively, by simply replacing the substrate CTZ with 1d. The optical properties of the new CTZ analogues were investigated such as the kinetic parameters, dose dependency, and luciferase specificity. The 2-series CTZ analogues interestingly have specificity to ALucs and are completely dark with RLuc derivatives, and 3d is highly specific to only NanoLuc. We further determined the theoretical background of the red-shifted BL maximum wavelengths (λBL) values according to the extended π conjugation of the CTZ backbone using Density Functional Theory (DFT) calculations. This color-tunable BL imaging system provides a useful multicolor imaging portfolio that efficiently images molecular events in mammalian cells.

Multi-Channel Optical Detection with an SPR Imaging System and Integrated Waveguide Based SPR Devices

2001 ◽  
pp. 359-360
Author(s):  
Osamu Niwa ◽  
Tatsuya Tobita ◽  
Yuzuru Iwasaki ◽  
Tsutomu Horiuchi ◽  
Hisao Tabei ◽  
...  
Keyword(s):  
Imaging System ◽  
Optical Detection ◽  
Spr Imaging

scholarly journals EFFECT OF REFLECTOR DEFORMATION ON OPTICAL DETECTION SENSITIVITY FOR OPTICAL READOUT INFRARED IMAGING SYSTEM

2009 ◽  
Vol 28 (4) ◽  
pp. 249-253
Author(s):  
Jie GAO ◽  
Qing-Chuan ZHANG ◽  
Da-Peng CHEN ◽  
Bin-Bin JIAO ◽  
Hai-Tao SHI ◽  
...  
Keyword(s):  
Infrared Imaging ◽  
Imaging System ◽  
Optical Detection ◽  
Detection Sensitivity ◽  
Optical Readout ◽  
Infrared Imaging System

scholarly journals Perovskite Downconverters for Efficient, Excellent Color-Rendering, and Circadian Solid-State Lighting

Nanomaterials ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 176 ◽  
Author(s):  
Ziqian He ◽  
Caicai Zhang ◽  
Hao Chen ◽  
Yajie Dong ◽  
Shin-Tson Wu
Keyword(s):  
Solid State ◽  
Biological Effects ◽  
Low Cost ◽  
Solid State Lighting ◽  
Central Wavelength ◽  
Perovskite Nanocrystals ◽  
Color Tunable ◽  
Systematic Optimization ◽  
Color Rendering ◽  
Excellent Color

Advances in materials, color rendering metrics and studies on biological effects promote the design for novel solid-state lighting sources that are highly energy efficient, excellent at color rendering and healthy for human circadian rhythms. Recently, perovskite nanocrystals have emerged as narrow-band, low-cost, color-tunable downconverters, elevating the design and development of solid-state lighting to a new level. Here, we perform a systematic optimization of using perovskite nanocrystals as downconverters to simultaneously optimize vision energy efficiency, color rendering quality and circadian action effect of lighting sources at both fixed and tunable color temperatures. Further analysis reveals the inherent differences in central wavelength and bandwidth preferences for different cases, providing a general guideline for designing circadian lighting. Through systematic optimization, highly efficient circadian lighting sources with excellent color rendering can be achieved.

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